Re: toolchain/57466

[Jan-Benedict Glaw <jbglaw%lug-owl.de@localhost>]

The following reply was made to PR toolchain/57466; it has been noted by GNATS.

From: Jan-Benedict Glaw <jbglaw%lug-owl.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: toolchain/57466
Date: Tue, 13 Jun 2023 12:30:39 +0200

 --i7nd2ngnb25fasot
 Content-Type: text/plain; charset=utf-8
 Content-Disposition: inline
 Content-Transfer-Encoding: quoted-printable
 
 Hi!
 
 As I got to this issue while trying to get reproducible builds for
 VAX, here's some more notes:
 
   * With the previously mentioned patch (map all files instead of only
     debug infos), almost all VAX stuff is reproducible.
   * Notable deviations:
     * Everything that used `-g` in their CFLAGS will have the current
       build directory (for DW_AT_comp_dir) in the object files. This
       affects blocklistctl/blocklistd and netpgpverify, but also (all
       of?) the kernel files.
     * The two (C + C++) ubsan tests. It seems ubsan inserts, on its
       own, the source filename into the object files without being
       mapped. (At least for gcc.old, which is used for VAX. Haven't
       checked yet with the amd64 builds.)
 
 So we have three primary issues:
 
   1. Globally wrong CFLAGS not hiding (as expected) the source
      location. This will affect all ports.
 
   2. Issue with CWD mapping for the DW_AT_comp_dir attribute when
      `-g` is in place. Haven't yet looked at this, might be an issue
      with some missing CFLAG or a compiler issue. If it's a compiler
      issue, it at least affects gcc.old, gcc is untested as of now.
 
   3. ubsan (at least with gcc.old) inserting filenames as well. Need to
      check for gcc.
 
 At least the first issue cripples all ports. The second and third may
 be a niche thing wrt. gcc.old .  But all of these can be solved.
 
 MfG, JBG
 
 --=20
 
 --i7nd2ngnb25fasot
 Content-Type: application/pgp-signature; name="signature.asc"
 
 -----BEGIN PGP SIGNATURE-----
 
 iF0EABECAB0WIQQlDTvPcScNjKREqWEdvV51g5nhuwUCZIhFTQAKCRAdvV51g5nh
 uydtAKCFIL8Kj1ffYXkHq+2Wu18Jn7QpIACbB54R02gmp8CxTziZ1Ombh1K1Vdg=
 =NmQg
 -----END PGP SIGNATURE-----
 
 --i7nd2ngnb25fasot--